J/ApJ/707/L56ivo://CDS.VizieR/J/ApJ/707/L56doi:10.26093/cds/vizier.17079056CDSKovalev Y.Y.2026-07-02T11:57:44Z2012-02-02T14:40:06ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgamma-ray-astronomyradio-continuum-emissionastronomical-object-identificationA list of 205 {gamma}-ray strong objects was reported recently as a result of a three-month integration with the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope. We attempted identification of these objects, cross-correlating the {gamma}-ray positions with very long baseline interferometry (VLBI) positions of a large all-sky sample of extragalactic radio sources selected on the basis of their parsec-scale flux density. The original associations reported by the Fermi team are confirmed, and six new identifications are suggested. A Monte Carlo analysis shows that the fraction of chance associations in our analysis is less than 5%, and confirms that the vast majority of {gamma}-ray bright extragalactic sources are radio-loud blazars with strong parsec-scale jets. A correlation between the parsec-scale radio and {gamma}-ray flux is supported by our analysis of a complete VLBI flux-density-limited sample of extragalactic jets. The effectiveness of using a VLBI catalog to find associations between {gamma}-ray detections and compact extragalactic radio sources, especially near the Galactic plane, is demonstrated. It is suggested that VLBI catalogs should be used for future identification of Fermi/LAT objects.2009ApJ...707L..56Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/707/L56CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/251 : VLBI International Celestial Reference Frame (ICRF) (Ma+, 1997)J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)J/ApJS/183/46 : Fermi/LAT bright gamma-ray source list (0FGL) (Abdo+, 2009)J/AJ/136/580 : Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)J/AJ/133/1236 : Fifth VLBA calibrator survey: VCS5 (Kovalev+, 2007)J/AJ/131/1872 : Fourth VLBA calibrator survey: VCS4 (Petrov+, 2006)J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005)J/AJ/127/3587 : VLBI ICRF. II (Fey+, 2004)J/AJ/126/2562 : Second VLBA calibrator survey: VCS2 (Fomalont+, 2003)J/ApJS/141/13 : VLBA calibrator survey: VCS1 catalog (Beasley+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/707/L56https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/707/L56http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/707/L56https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/707/L56https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/707/L56http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/707/L56GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/707/L56/table1 (VLBI associations of the Fermi LAT bright sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/707/L56/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/707/L56/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/707/L56/table1?GETtext/xml+votable180.050000true4.399238333-5.2116020280.0055555555555555566/579 911 1701 2122 2331 2414 2836 4695 4770 5423 5817 6018 6088 6368 6507 6777 6963 7045 7346 7426 7446 7896 8299 8466 8915 9075 9460 9612 10422 11153 11649 12604 12619 13485 13927 14751 14854 15969 16027 16298 16720 17186 17364 17579 17857 17927 18624 19370 19398 19622 19831 20099 21121 21564 22271 23121 23897 24084 24608 24845 25302 25677 25818 26131 26292 27060 27243 27311 27433 28479 28492 28517 28673 29016 29072 30446 31663 31894 32311 33825 34123 34461 34572 35079 35281 35706 35786 36058 36151 36554 36941 37215 37529 39235 40479 42515 42980-42981 43085 43122 43262 44069 44247 44908 45011 46055 46251 47014 47375 48123 490715.300855656246408e-24 5.300855656246408e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/707/L56?format=asciiGamma-rayRadiodefaultJ/ApJ/707/L56/table1VLBI associations of the Fermi LAT bright sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint0FGLFermi LAT bright source name (JHHMM.m+DDMM)meta.id.assoccharVLBIIAU name (HHMM+DDd, B1950) of VLBI association (<IERS BHHMM+DDd> or <IVS BHHMM+DDd> in Simbad)meta.id;meta.maincharDPFermi LAT and VLBI association position differencedegpos.angDistancefloatR95Fermi LAT 95% confidence radiusdegphys.angSizefloatRAJ2000VLBI association Hour of Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000VLBI association Degree of Declination (J2000)pos.eq.dec;meta.mainS8? Total parsec-scale flux density at 8GHzJyphot.flux.density;em.radio.6-12GHzfloatnullableICRFMatches within 1.5" with VLBI catalogsmeta.idintnullableSimbadSimbad column added by the CDSchar